SMS/CALL problems

[EEEP]

Well...My Xperia U is two years old and just now having annoying problem.

1.st problem is that when i recieve a text message,it duplicates itself like every 5 minutes,like i would recieve a "NEW"message,but the message is from the same one.Even if i am recieving from different people ,i will recieve multiple same messages ,that i read and deleted 

2.nd problem is that it takes a while to contact someone.Example,when i press call to a friend ,then my phone shows home screen and after 20-40 seconds its stars to call that person.

I tried "Repair Xperia™" using "Sony Bridge for Mac" device,but that helped for like 2 days and now its starts again...Its quite annoying to recieve same message all the time,and calling someone takes a while...

I used same sim card on my k550i,but it worked fine,it seems ,that this phone is going crazy

[Alexander1]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

I would suggest that you try to boot your phone into safe mode to see if the problem may be related to any 3rd party app that you have installed in your phone:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

[EEEP]

I tried factory reset,helped for like one day then again...

I gave my phone to guarante service (luckily guarante was active a few more weeks),they fixed,problem was with anntena

So now i got new anntena for phone...

Hoping it wont go mad again

Thanks for respond